Example Question: 

The customer bought the SP-XL8040 to be used for maple syrup production. Now he wants to know the PH of sulfur acid rating for washing the RO membrane. He said that the other membranes they used, the PH takes from 11-12.


Answer:

The customer's typical cleaning procedure will be fine, as long as they work within the manufacturer's recommended water temperature and their tools are properly calibrated. Specifically, for the higher pH of this customer's cleaning solution, they'll need to keep the water temperature below 86℉ (30℃). Here are the membrane cleaning specs.


Data:


Relationship between pH value of cleaning solution and cleaning water temperature: 



Reverse Osmosis Membrane Models 

Cleaning water temperature:

< 86℉ (30℃)

<95℉ (35℃)

< 113℉ (45℃)

Cleaning solution pH:  

XL, UL, BR, FR

2–12

2–11.5

3–10

This table shows the maximum cleaning water temperatures for different pH ranges. While more extreme conditions may improve cleaning effectiveness, they could reduce the membrane's service life. The manufacturer recommends using gentler cleaning methods or limiting the contact time between cleaning chemicals and membrane components while ensuring effective cleaning. Your pH meter should be regularly calibrated to ensure accurate readings.


Note: During the cleaning process, contaminants will consume cleaning agents, causing the pH value to change and reducing the cleaning effectiveness. Therefore, it's necessary to monitor pH values continuously and make adjustments as needed. When the pH deviates by 0.5 or more from the target value, additional cleaning agent should be added.